sae architecture #4

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SAE Architecture #4(Handover, Network Assisted Cell Change)Advenced Network Design and Analysis Lab.ContentsIntra-E-UTRAN handoverX2-based handoverS1-based handover

Inter RAT handoverE-UTRAN to UTRAN Iu mode Inter RAT handoverUTRAN Iu mode to E-TRAN Inter RAT hanvoverE-UTRAN to GERAN A/Gb mode Inter RAT handoverGERAN A/Gb mode to E-UTRAN Inter RAT handoverInter RAT handover Cancel

Network Assisted Cell ChangeArchitecture Principles for E-UTRAN to GERAN NACC

1X2-based handover without Serving GW relocation2

X2-based handover without Serving GW relocation3

X2-based handover without Serving GW relocation4

X2-based handover with Serving GW relocation5

X2-based handover with Serving GW relocation6

S1-based handover, normal7



S1-based handover, Reject10

S1-based handover, CancelInstead of completing the handover procedure, the source eNodeB may at any time during the handover procedure, up to the time when a handover command message is sent to the UE cancel the handover.

11Inter RAT handoverInter RAT handover is the handover between LTE with other Radio Access network12E-UTRAN to UTRAN Iu mode Inter RAT handover13

Preparation PhaseE-UTRAsN to UTRAN Iu mode Inter RAT handover14

UTRAN Iu mode to E-TRAN Inter RAT hanvover15

Execution PhaseE-UTRAN to UTRAN Iu mode Inter RAT handover Reject16

UTRAN Iu mode to E-UTRAN Inter RAT handover17

Preparation PhaseUTRAN Iu mode to E-UTRAN Inter RAT handover18Execution Phase

UTRAN Iu mode to E-UTRAN Inter RAT handover reject19

E-UTRAN to GERAN A/Gb mode Inter RAT handover20

Preparation PhaseE-UTRAN to GERAN A/Gb mode Inter RAT handover21

Execution PhaseE-UTRAN to GERAN A/Gb mode Inter RAT handover reject22

GERAN A/Gb mode to E-UTRAN Inter RAT handover23

Preparation PhaseGERAN A/Gb mode to E-UTRAN Inter RAT handover24

Execution PhaseGERAN A/Gb mode to E-UTRAN Inter RAT handover reject25

Inter RAT handover Cancel26

Network Assisted Cell Change27

Architecture Principles for E-UTRAN to GERAN NACC

8. Tracking Area Update procedure

5. End marker

5. End marker

Downlink data

7 Release Resource

6 Path Switch Request Ack

4 Modify Bearer Response

2 Modify Bearer Request

1 Path Switch Request

Uplink data

Downlink data

Forwarding of data

Handover preparation

Downlink and uplink data

Handover execution

Target eNodeB

MME

PDN GW

Serving GW

Source eNodeB

UE

Handover completion

3a Modify Bearer Request

3b Modify Bearer Response

(A)


(B)

(A)

7b. Delete Session Response

7a. Delete Session Request

Uplink data

Downlink data

6. Release Resource

5. Path Switch Request Ack

4. Create Session Response

2. Create Session Request

3b. Modify Bearer Response

1. Path Switch Request

Uplink data

Downlink data

Forwarding of data

Handover preparation

Downlink and uplink data

3a. Modify Bearer Request

Handover execution

eNodeB

Target

Serving GW

Target

MME

PDN GW

Serving GW

Source

eNodeB

Source

UE

Handover completion


4a. Create Session Response

6. Create Indirect Data Forwarding Tunnel Request

6a. Create Indirect Data Forwarding Tunnel Response


Uplink User Plane data

19a. UE Context Release Command

(B)

19d. Delete Session Response

19c. Delete Session Request


11b. Only for Indirect forwarding of data

(A)


.

16a. Modify Bearer Response

14b. Forward Relocation Complete Acknowledge

14. Forward Relocation Complete Notification

13. Handover Notify

Downlink data

12. Handover Confirm

10c. MME Status Transfer

11a. Only for Direct forwarding of data

10. eNB Status Transfer

9a. Handover Command

9. Handover Command

7. Forward Relocation Response

5a. Handover Request Acknowledge

20b. Delete Indirect Data Forwarding Tunnel Response

19b. UE Context Release Complete

5. Handover Request

3. Forward Relocation Request

20a. Delete Indirect Data Forwarding Tunnel Request

1. Decision to trigger a relocation via S1

Downlink User Plane data

2. Handover Required


15. Modify Bearer Request

17. Modify Bearer Response


HSS

synchronize to new cell

Detach from old cell and

eNodeB

Target

GW

Target Serving

MME

Target

PDN GW

Serving GW

Source

MME

Source

eNodeB

Source

UE

21b. Delete Indirect Data Forwarding Tunnel Response

21a. Delete Indirect Data Forwarding Tunnel Request

10a. Forward Access Context Notification

10b. Forward Access Context Acknowledge



7. Delete Session Request

7a. Delete Session Response

.

6b. Handover Request Acknowledge

9. Handover Preparation Failure

8. Forward Relocation Response (Reject)

6a. Handover Failure

Request

Handover

5.


1. Decision to trigger a relocation via S1



HSS

eNodeB

Target

GW

Target Serving

MME

Target

PDN GW

Serving GW

Source

MME

Source

eNodeB

Source

UE





Serving GW

Target

User Plane PDUs

Uplink and Downlink

Create Indirect Data Forwarding Tunnel Response

a.

8

PDN GW

Source


Create Indirect Data Forwarding Tunnel Request

.

8

Request Acknowledge

5a. Relocation

Request

5. Relocation


Required

Handover

2.

1. Handover Initiation

HSS

Serving GW

Target SGSN

Source MME

Target RNC

eNodeB

Source

UE

11b. Release Resources


(B)


10. Routeing Area Update procedure

For Serving GW relocation Steps 7, 8 and 9, and the following User Plane path, will be handled by Target Serving GW

Via Target SGSN in case Direct Tunnel is not used


(A)

Serving GW

Target

If Indirect Forwarding applies.

If Direct Forwarding applies

Downlink User Plane PDUs

4a. Handover to UTRAN Complete

13a. Delete Indirect Data Forwarding Tunnel Response

Uplink and Downlink User Plane PDUs (Via Target SGSN if Direct Tunnel is not used)




6a. Forward Relocation Complete Acknowledge


5. Relocation Complete

12. Delete Indirect Data Forwarding Tunnel Request

Source



4. UTRAN Iu Access Procedures

Sending of uplink datapossible

-

2. HO from E-UTRAN Command

1. Handover Command

Uplink and Downlink User Plane PDUs

PDN GW

HSS

Serving GW

Target SGSN

Source MME

Target RNC

eNodeB

Source

UE




Serving GW

Target



User Plane PDUs

Uplink and Downlink

PDN GW

.8. Forward Relocation Response (Reject)

6. Relocation Failure

Source

5. Relocation Request




HSS

Serving GW

Target SGSN

Source MME

Target RNC

eNodeB

Source

UE



Serving GW

Target

Indirect Data Forwarding Tunnel Response

Create

.

a

6

Indirect Data Forwarding Tunnel Request

Create

.

6

not used)

is

in case Direct Tunnel

User Plane PDUs (via Source SGSN

Uplink and Downlink

Indirect Data Forwarding Tunnel Response

Create

8a.

GW

PDN

. Forward Relocation Response

7

Indirect Data Forwarding Tunnel Request

Create

.

8

5a. Handover Request Acknowledge

Request

5. Handover


2. Relocation Required


HSS

Serving GW

Target MME

Source SGSN

eNodeB

Target

RNC

Source

UE

Via Source SGSN in case Direct Tunnel is not used


Sending of uplink data possible

12b. Iu Release Command/Completion


(B)




(A)


Serving GW

Target

If Indirect Forwarding applies

If Direct Forwarding applies

Downlink Payload User Plane PDUs (via Source SGSN if Direct Tunnel is not used)







6. Handover Notify

5. HO to E-UTRAN Complete

4. E-UTRAN Access Procedures

2. HO from UTRAN Command

1. Relocation Command

Uplink and Downlink User Plane PDUs (via Source SGSN if Direct Tunnel is not used)

GW

PDN

HSS

Serving GW

Target MME

Source SGSN

eNodeB

Target

RNC

Source

UE

Source




Uplink and Downlink User Plane PDUs (via Source SGSN in case Direct Tunnel is not used)

9. Relocation Preparation Failure



Serving GW

Target



GW

PDN

8. Forward Relocation Response (Reject)

6. Handover Failure

5. Handover Request

Source


2. Relocation Required


HSS

Serving GW

Target MME

Source SGSN

eNodeB

Target

RNC

Source

UE





Serving GW

Target

PDUs

User Plane

Uplink and Downlink


PDN GW



5a. PS Handover Request Acknowledge

Source

5. PS Handover Request




HSS

Serving GW

Target SGSN

Source MME

BSS

Target

eNodeB

Source

UE


(B)


14b. Release Resource

13. Routeing Area Update procedure



(A)


Serving GW

Target


Only if Direct Forwarding applies

Downlink User Plane PDUs

re-establishment and XID negotiation for LLC ABM)

12a. SABM UA exchange

12. XID Negotiation for LLC ADM

7. XID Response

Only if Indirect Forwarding applies






6. PS Handover Complete

5. XID Response


Source

4. GERAN A/Gb Access Procedures


2. HO from E-UTRAN Command

1. Handover Command


GW

PDN

HSS

Serving GW

Target SGSN

Source MME

Target BSS

eNodeB

Source

UE



13a. PS Handover Complete Ack

Serving GW

Source





6. PS Handover Request Nack

5. PS Handover Request






Serving GW

Target

PDUs

User Plane

Uplink and Downlink

PDN GW

HSS

Target SGSN

Source MME

BSS

Target

eNodeB

Source

UE



Serving GW

Target



PDUs

User Plane

Uplink and Downlink


PDN GW



5a. handover Request Acknowledge

5. Handover Request


2. PS Handover Required


HSS

Serving GW

Target MME

SGSN

Source

eNodeB

Target

BSS

Source

UE

Source






(A)


. Modify Bearer Request

8

Only if 'Indirect Forwarding' applies


Serving GW

Target

Source

Only if 'Direct Forwarding' applies




11. BSS Packet Flow Delete Procedure



6. Handover Notify

5. HO to E-UTRAN Complete



4. E-UTRAN Access Procedures


2. PS Handover Command

1. PS HO Required Acknowledge


GW

PDN

HSS

Serving GW

Target MME

Source SGSN

eNodeB

Target

BSS

Source

UE

9. PS Handover Required Negative Acknowledge



Serving GW

Target



PDUs

User Plane

Uplink and Downlink

GW

PDN

Source

. Forward Relocation Response (Reject)

8

6. Handover Failure

5. Handover Request


2. PS Handover Required


HSS

Serving GW

MME

Target

SGSN

Source

eNodeB

Target

BSS

Source

UE

Only if Source RAN is eNodeB

7. Handover Cancel Acknowledge

Only if Source RAN is RNC

7. Relocation Cancel Acknowledge

Only if Target RAN is eNodeB

Only if Target RAN is RNC

Only if Target RAN is BSS

4. Release Resources

4. Delete BSS PFC Procedure

Only if Source RAN is eNodeB

2. Handover Cancel

Only if Source RAN is RNC

2. Relocation Cancel

Only if Source RAN is BSS

1. Source RAN (BSS, RNC or eNodeB) decides to cancel the handover procedure

TargetRAN

TargetServing GW



PDN GW

6. Relocation Cancel Response

4. Iu Release Procedure

3. Relocation Cancel Request

2. PS Handover Cancel

HSS

SourceServing GW

TargetSGSN/MME

SourceMME/SGSN

SourceRAN

UE





sae architecture #4

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